Wood-barking machine.



N. K. F. HANSON.

WOOD BABKING MACHINE.

APPLIOATION FILED MAY 15, 1911.

` Patented Apr. 23, 1912.

5 SHEETS-SHEET 2.

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N. K.P. HANSON. WOOD kBARKING MACHINE. APPLIOATION FILED 11u15, 1911.

Patented Apr. 23, 1912.

SBHEETS-SHEET 1.

COLUMBIA PLANUORAPH C0.. WASHING-K1N. D. c.

N. K. F. HANSON.

WOOD BARKING MACHINE.

APPLICATION FILED MAY 15, 1911.

1,024,198. Patented Apr.23,1912.

5 sums-SHEET a. 9 a Egal l coLuMnlA PLANOGRAPH C0..WAsHlNn'roN.D. c.

N. K. F. HANSON.

WOOD BARKING MACHINE.

APPLIoATloN FILED MAY 15, 1911.

` 1,024, 1 98, Patented Apr. 23, 1912.

5 SEEETS-SHEET 4.

Patented Ap.23,1912.

5 SHEETS-SHEET 5.

COLUMBIA PLANoGnAPH co.. wAsHlNaToN. D. c.

NILS KNUT FREDRIK HANSON, OF STOCKHOLM, SWEDEN.

W0 OD-BARKING MACHINE.

To all whom it may concern:

Be it known that I, NILs KNUT FREDRIK HANsoN, a subject of the King of Sweden, and resident of Regeringsgatan 43, Stockholm, in the Kingdom of Sweden, have invented certain new and useful Improvements in food-Barking Machines, of which the following is a specification, reference being had therein to the accompanying drawmgs.

This invention relates to a machine for removing bark from logs in short pieces. The said machine comprises a vertical or substantially vertical rotary disk armed with knives, against the side of which disk the log is forced.

The characteristic features of the machine consist in two rollers being provided, supporting the log, from which the bark is being removed, which rollers can be moved from and toward the knife disk and force the log against the disk in oblique directions respectively with relation to the same, and in such guides for the said rollers being provided, that the rollers in any position, determined by the greater or short-er diameter of the log, keep the log in the same position as to the distance of its center from the centerline of the disk, however the said diameter may change. Owing to the said arrangement the diameter vof the knife disk may be comparatively short and the knives will always act at the same angle with relation to the longitudinal axis of the log, in consequence whereof the said angle may be so adapted that it forms the one most suitable to the cutting operation of the disk.

In the drawings, Figure 1 is a front elevation of a wood-barking machine, einbodying the improvements of my present invention. Fig. 1a is a partial cross-section on line w m Fig. 1. Fig. 2 is a side elevation of the machine, and Figs. 3 to 8, inclusive, are each a side elevation illustrating modified means for adjusting the rollers to maintain the log in the position against the disk carrying the knives.

The disk 1, provided with knives 2, is fixed to a horizontal driving shaft 3 and rotates in a casing 4, provided in one of its sides with an opening, through which the log is forced against the disk. At the said side of the knife disk the frame 5 of the machine forms a table in the shape of a horizontal or subst-antially horizontal hollow 6, extending along the disk, in which Specification of Letters Patent.

Application filed May 15, 1911.

PatentedApr. 23, 1912.

Serial No. 627,372.

hollow the log is located. Two horizontal rollers 7, 8, which are located above the bot-tom of the hollow, one above the other and at some distance from the same, are adapted to guide the log during the peeling operation. The top roller 7 is journaled at its ends in a slide 9 extending upward in an oblique direction from the disk 1 and movable in a guide 10. The said slide meshes with or is connected in any suitable manner with a sector shaped wheel 11, journaled in the frame and acting like a two armed lever, by means of which wheel the slide is moved in its guide. The roller 8 is journaled in the same manner in a slide 12, which extends downward in an oblique direction from the disk 1. The said slide is located in a guide 13 and is connected with a sector shaped wheel 14, meshing with the wheel 11, so that bot-h the rollers are moved simultaneously toward and from the disk 1 respectively, as the shaft 15 ofthe wheel 14 is rotated by means of a hand wheel 16 fixed on the same, the top roller being moved upward in an oblique direction from the disk 1, while the lower roller is moved downward in an oblique direction. Consequently, the rollers approach each other or are moved from each other according as they approach the knife disk or are moved from the same. The slides 9, 12 which have such positions, that one of the same compensates the weight of the other and its roller and vice versa, are supported by rollers located in the guides. The rollers 7 8 are rotated by a suitable driving device for instance a chain 17, passing around a guide roller 18 and a driving pulley 19. The said chain is tightened by a roller 20, journaled in an arm 21, which is swingable around the shaft of the pulley 19 and is forced downward by a suitably adapted weight 22 suspended from the arm 21. The pulley 19 is rotated by the shaft 3 or a special shaft by means of a worm gear 23 or the like.

Before the log is placed in the hollow G, the rollers 7, 8 are movedr away by means of the hand wheel 16 and a mechanism which will now be described. Immediately be hind the shaft 15 a counter-weight 25 is located, consisting of a horizontal cylinder or the like and provided with end trunnions with rollers bearing against the upper edges of two members 26 extending longitudinally of the shaft 3, the said edges forming races for these rollers. The upper edges of said members extend upward toward the knife disk 1, as shown in Fig. 2. The end-trunnions of the weight or cylinder 25 are embraced by two arms 27, 27, fixedy to the shaft 11 of the sector shaped wheel 11 and extending downward. The said arms are provided with slots 28 for the end-trunnions which slots are shaped as shown in Fig. 2. Owing to the slanting position of the upper edges of the members 26 the weight 25 tends to swing the arms 27, 27, acting like a crank, in such direction, that the slides 9, 12 and the rollers 7, 8 are forced forward toward the disk 1. If the hand wheel 16 is rotated in a direction opposite to that indicated by the arrow in Fig. 2, the weight 25 is moved on the race 26, toward the disk 1, at the same time as the rollers 7, S are moved from the disk 1. The slots 28 are so shaped, that, when the hand wheel has been rotated as far as possible, the weight- 25 bears against the walls of the slots perpendicularly to the same end toward the axis of the shaft 11X, so that the turning movement is reduced to m'l and the mechanism is locked. The roller 8 has then such a retracted posit-ion, that its top side is located somewhat below the hollow 6 and the log, when placed into the hollow, will be located in front of the roller 8. There is now no obstacle to the placing of the log into the hollow. A roller 29 journaled in the same forms an end abutment for the log. The hand wheel 16 is now rotated in the opposite direction, indicated by the arrow in Fig. 2, during which operation the counter-weight 25 moves downward on the members 26 and the lower roller 8 forces the log upward toward the disk 1. At the same time the top roller 7 is moved down ward toward the log. During the peeling operation the log is rotated perfectly uniformly, owing to the fact that the rollers 7, 8 are fluted longitudinally, sharp edges being provided between the grooves which edges engage the log, as the hand wheel 16 is rotated forcibly.

During the peeling operation the weight 25 assists in keeping the log forced against the knife disk. As seen from Fig. 2, the bisector of the angle, which the slide 9 forms with the slide 11, is horizontal and passes through the center line of the log, owing to which fact the generatrix of the log, longitudinally of which the cutting operation is effected, always is in the same position with relation to the knife disk, whether the log has a great or a shortdiameter. In order that knots and the like or any irregularities in the shape of the log may not make necessary a rotation of the hand-wheel 16, the roller 7 is yielding, which is effected by the sectorshaped wheel, acting upon the slide 9, being made into two parts, one 30 of which is connected with the slide and loosely mounted on the shaft 11X, while the other part 31, consisting of an arm or the like and meshing with the wheel 14, is firmly fixed on the shaft 11X, and by springs 32 being located between the parts, as shown in Fig. 2.

After the barking or peeling operation has been effected, the hand-wheel 16 is so rotated, that the roller 8 is lowered. The log accompanies the roller downward, until the roller 8 is locked by the counter-weight 25. The log now rests freely on the bottom of the hollow 6 and can be pushed from the same. Logs having a diameter of 60 millimeters up to 200 millimeters canbe peeled in the machine described above.

The mechanism for moving and rotating the rollers 7, 8 may be modified in many ways. Some of these various ways are shown in Figs. 3 to 8 inclusive. In Fig. 3, 10 and 13 are guides corresponding to the guides shown in Fig. 2. An arm 33, extending upward from a shaft 34 and swingable Aaround the same, carries a shaft 35, which is rotated by the shaft 34 by means of a chain or the like. Between t-he shaft 35 and the shafts of the rollers 7, 8 distance arms 35X are provided. The motion of the shaft 35 is transmitted to the rollers 7, 8 by means of a chain or the like, so that the said rollers are rotated. The said arm 33 is swingable toward and from the disk 1 and is provided with a curve shaped rack 36, the center point of which is located on the center line of the shaft 34. The said rack 36 meshes with a pinion, fixed' to the shaft 15 of the hand wheel 16. Consequently, as the said hand-wheel is rotated, the rollers 7, 8 are moved simultaneously and the same distance.

In Fig. 4 the slides have a vertical position and are provided with rollers engaging oblique slots 38, 39 respectively, provided in the frame of the machine. The guides 37, 37X of the slides are movable toward and from the disk 1 and can be moved by the hand-wheel 16 by means of a rack and a pinion or in any other suitable manner. The slot 38 for the slide of the top roller 7 extends in an oblique direction upward from the disk 1, and the slot for the slide of the lower roller 8 extends in an oblique direction downward. Consequently, as the hand-wheel 16 is rotated, the rollers 7, 8 are moved in a manner similar to that described above.

In Fig. 5 the guide is horizontal and the rollers 7, 8 are moved by means of the handwheel 16. The lower roller 8 is supported by the table or hollow 6. The top roller 7 is supported and guided by two arms 40, 41, one of which is swingable around' the shaft 15 of the hand-wheel, while the other is swingable around a shaft 42X, located at a lower level. The arms 40, 41 are so located with relation to each other, that a motion, similar to that described above, is imparted to the roller 7, as the hand-wheel is rotated. The slanting position of the table 6 results in a motion, similar to that of the top roller, being imparted to the lower roller as to its raising and lowering.

According to Fig. 6 the rollers 7 and 8 i are j ournaled in an arm 42, which is swingable toward and from the disk 1 around a shaft 43, so located, that the top roller 7 is moved in a manner similar to that described above, when the arm is oscillated by means of a rack and pinion or the like. The roller 8 is supported by the table 6 and is provided with end trunnions extending into slots 44 provided in the arm 42. The pulley, rotating the rollers 7, S by means of a chain or the like, is fixed on the shaft 43.

The arrangement shown in Fig. 7 is similar to that shown in Fig. 5, but the arm, carrying the roller 8, consists of racks movable toward and from the disk 1 and meshing with pinions on the stationary, horizontal shaft 15 of the hand wheel 16. Projections 45 extend upward from the said racks and to the said projections arms 46 are pivoted, guiding the roller 7. The said roller 7 is supported and guided also by the arms 47.

According to Fig. 8 the arms 49, 50, carrying the rollers 8 and 7 respectively, cross each other and are fixed to shafts, so located, that the rollers are moved in the desired paths. Toothed sectors 51, 52 are fixed to the said shafts, meshing with a common screw spindle 53, which is journaled in the frame in a position parallel to the shaft of the disk 1.

The driving mechanisms of the rollers 7, 8 are easily understood from the drawings. Similar means for supporting the rollers are provided at both ends of the same, although, for the sake of simplicity, the arms have been described above as consisting of single pieces. The shaft 3 may have a slanting position z'. e. the disk.1 need not necessarily be vertical. The bark is removed from the casing through the outlet 4X. I

It will be understood that in cases where the same is necessary or desirable, to effect a relatively small extent of movement to the slides 9 and 12 by the rotation of the handwheel 16, that without departing from the nature and spirit of my invention, the handwheel 16 may be mounted loosely on the shaft 15 and connected by a reduction gearing to the sector-shaped wheel 14.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a wood-barking machine, the combination with a disk and knives carried thereby, of devices for maintaining a log in position with its side against the said disk, and means for automatically adjusting the said devices in such a manner that during the barking operation the distance between the center of t-he log and the center of the disk is constant.

2. In a wood-barking machine the conibination with a disk and knives carried thereon, of two rollers adapted to engage la log and maintain the same in position against the said disk, and means for automatically adjusting the positions of the said rollers in such a manner that the distance between the center of the log and the center of the disk is constant irrespective of the diameter of the log.

3. In a wood-barking machine, the combination with a disk and knives carried thereby and a disk shaft which is placed substantially horizontal, of an upper roller and a lower roller, the said rollers being adapted to bear against a log' placed between them to maintain the log in position against the disk, slides to which the said rollers are connected, guides for the said slides fixed at such an angle to one another that the bisector of this angle is horizontal and passes through the longitudinal center of the log, and means co-acting with the said guides and slides for moving the said rollers from the disk when a log is placed in the machine, and then moving the said rollers back to position to bear against the log.

4. In a wood-barking machine, the combination with a rotary disk and knives carried thereby, of an upper roller and lower roller, said rollers being adapted to bear against the log and maintain the same in position with its side against the said disk, guides for the said rollers, means for moving the said rollers simultaneously from and toward the said disk, and a table or hollow upon or in which the log is placed in the machine after the said rollers have been moved from the said disk, the said log being then moved toward and into contact with the disk by the rollers when the same are moved in the opposite direction.

5. In a wood-barking machine, the combination with a rotary disk and knives carried thereby, of two rollers adapted to bear against a log to maintain the same forcibly against the said disk, slides in which the said rollers are mounted, guides in which the said slidesV move, the said slides and guides being placed at an angle to one another, racks on the said slides, sector wheels gearing' with each other and with the said racks so that the said slides are moved simultaneously, and means for operating the said sector wheels.

6. In a wood-barking machine, the combination with a rotary disk and knives carried thereby, of two rollers, slides to which the rollers are connected, guides in which the slides move, sector wheels for moving the said slides in the guides, shafts upon which the sector wheels are mounted, arms secured to the shaft of one of the said sector wheels, and means acting against the said arms tending to automatically move the said slides and rollers toward the said disk to maintain the log in position between the said rollers and disk.

7. In a wood-barking machine, the combination with a rotary disk and knives carried thereby, of two rollers, slides to which the rollers are connected, guides in which t-he slides move, sector wheels for moving the said slides in the guides, shafts upon which the sector wheels are mounted, arms secured to the shaft of one of the said sector wheels, and a counter-weight acting upon the said arms tending normally to automatically move the said slides and rollers toward' the said disk.

8. In a wood-barking machine, the conibiiiation with a rotary disk and knives carried thereby, of two rollers, slides to which the rollers are connected, guides in which the slides move, sector wheels for moving the said slides in the guides, shafts upon which the sector wheels are mounted, arms secured to the shaft of one of the said sector wheels, a counter-weight and a slanting raceway for the said counter-weight, the said arms being so arranged that in certain positions thereof the turning movement of the weight will be reduced to zero.

9. ln a .wood-barking machine, the combination with a disk and knives carried thereon, of two rollers adapted to engage a log and maintain the same in position between the center of the log and the center p of the disk is constant irrespective of the diameter of the log, and means for rotating the rollers.

10. In a wood-barking machine, the combination with a rotary disk and knives carried thereby, of two rollers, means for adjusting the positions of the rollers on converging lines relatively to the said disk, so that the distance between the center of a log, placed between the rollers and the disk, and the center oft the disk is const-ant, and means whereby the position of one of the rollers is yielding in order that the log may not leave its position in the machine due to any irregularities in the surface thereof. Y

l1. In a wood-barking machine, the combination with a rotary disk and knives connected thereto, of rollers adjustable on converging liiies so that the distance between the center of a log placed between the rollers and the disk and the center of the disk, will be constant irrespective of the diameter of the log, and a table upon which the'log is received and placed in the machine, which table is constructed on` an incline so that the log when released by the rollers automatically leaves the machine.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

NILS KNUT FREDRIK HANSON. lVitiiesses HEDING MELINDER, GUsTAF IsFLT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

